Breach is an alternative game mode in Deus Ex: Mankind Divided. It is set in the virtual world of the Neural SubNet, but the augmentations and weapons used in this game mode are largely the same as Adam Jensen's.
The System Rift expansion mission serves as its prologue.
A hacker called ShadowChild sends out a message to countless other hackers, telling them that a "Breach" in the Palisade Blades' security has emerged. She urges these special hackers called "Rippers" to take advantage of this weakness while they have the chance by extracting data from the Palisade servers.
The objective of a map in Breach is to capture servers and download the information from them until you reach the minimum amount needed for that map. Once the minimum amount of data is reached or exceeded, you have to escape and return to the spawn point before the timer runs out. Some servers are hidden behind fake walls and secret doors, while others hang above on what initially appears to be inaccessible platforms. On average, Breach challenges can be completed in five minutes or less.
There are also various security features that you must get around. Obstructing both infiltration and escape are a host of cameras, sentinels, drones, turrets, humanoid guards, and later, the more powerful Prime guards. These opponents do not present much challenge in of themselves, but can still delay a player.
Strings of kills and other feats will boost a score multiplier, as will unlocking all the servers. Players' score is converted into a form of currency that can be used to buy booster packs of five cards. Each card can unlock a weapon, or upgrades, skills, health, ammo, and so on. More expensive packs provide rarer items. These packs can also be purchased through real-world currency.
An additional score multiplier is time. The faster a player completes their mission, the higher the score multiplier. Additional rewards will also be unlocked for completing a server within the designated speedrun time, extracting all the data from each data tower there, and for beating the designated high score.
The challenges of each server largely depend on the corporation its associated with.
- Tarvos servers rely on tight corridor environments with a mix of rooms, cover, and crawlspaces. Their defenses tend to focus around chokepoints, using a mixture of guards, cameras, and turrets.
- VersaLife servers rely on vertical layouts that can be confusing for avatars without jump or dash augmentations. Their defenses focus on using Sentry Robots, Drones, Turrets, and Hazards to automatically defend and protect sensitive areas.
- Steiner-Bisley servers rely on wide-open spaces, where enemies can attack you from multiple angles. Their defenses focus on guard patrols with a mixture of static turrets, so use of cover is recommended.
- Santeau servers are filled with wide expanses and enormous towers above bottomless drops, and are guarded by standard patrols and turrets. Jump augmentation software and scoped weapons are recommended.
In addition to hacking Tiers of corporate servers, the player can also take on Darknet Files, where someone on the Darknet has a serious issue and hires the Rippers for help. The player will often need to not only clear certain case-specific servers, but also call upon ShadowChild's specialists in the Military, Medicine, and Analytics for assistance, who will usually ask for a standard fee of 10000 for their services. The current set of available Darknet cases are as follows:
- Just What the Doctor Ordered - The parents of a 6-year-old girl with leukemia ask for help uncovering the details of her alleged demise within a VersaLife experimental treatment facility.
- A Life's Work - A man claiming to be a former engineer at Steiner-Bisley wants help recovering his designs for a special battery that can refuel combat robots with biomatter.
- A Force to Recon With - Las Aguilas is looking for information on a Tarvos' convoy protection detail for a charity in Mexico, which involves the La Garra Cartel and a rival Ripper.
- New World Problems - Canadian architect Christoph De Luca is trying to find out what happened to his wife, Mila, after she left to work on Rabi'ah and transferred their life savings to a bank there owned by The Santeau Group.